A Potential Link Between Waterfall Recession Rate and Bedrock Channel Concavity

摘要: The incision of bedrock channels is typically modeled through the stream power or shear stress applied on channel bed. However, this approach not valid for quasi-vertical knickpoints (hereafter waterfalls), where water and sediments do apply direct force vertical face waterfall retreat rate often as a function drainage area. These different modes are associated with two measurable exponents: concavity, $\theta$, that measured from topography used to evaluate exponents area slope in model, $p$, location waterfalls within watersheds, evaluates dependency recession To better understand relations between we systematically compare $p$ $\theta$. parameters were computed digital elevation models (30 m SRTM) 12 river basins easily detectable waterfalls. We show $\theta$ are: (1) similar uncertainty, (2) come distribution, (3) covary networks large number (>9). In context hints same processes govern non-vertical reaches analyzed basins, and/or downstream can dictate rate.